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E XPERIMENT 3 RC C OUPLED CE A MPLIFIER (E XPERIMENTAL ) I. OBJECTIVES - To provide the student with all aspects of the frequency response of capacitor-coupled BJT amplifiers. -To explore the effect of the coupling and bypass capacitors in low frequency. -To explore the effect of the junction capacitance at higher frequencies. II. INTRODUCTION AND THEORY The design procedure of any discrete amplifier can be summarized in the following steps: - Choose the circuit’s configuration that suits the application - DC design: this part is necessary to define the biasing and the stability of the chosen circuit configuration. - AC design: to determine the necessary parameters those are needed for the application such as amplifier gain and bandwidth. In this experiment we will concentrate on the AC design and briefly cover the aspect of the DC design. b) BJT internal capacitance a) Coupling and bypass capacitors R c V CC 2 R R 1 V in V out R E C E B E C V CE + - C C2 C C1 C cb C be ~ S R L R Figure 1 A single stage common –emitter amplifier is shown in figure 1-a. The biasing circuit consists of two resistors R 1 and R 2. It is called self-biasing technique that allows us to use a single power supply. The resistance E R is necessary to improve the stability of the amplifier, but on the other hand it reduces the gain. Therefore, a capacitor is connected across E R to preserve the DC characteristics of the amplifier while eliminating the negative effect of the E R on the gain in AC operation. This capacitor is called bypass capacitor E C . Other capacitors 1 C C and 2 C C are used 10
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to block the DC current from going in and out of the amplifier stage. This is necessary to maintain the quiescent point of the amplifier stage in the desired location, which is determined by the DC design procedure. These capacitors are called coupling capacitors. The above-mentioned capacitors are a lumped element that exist and can be seen and touched in
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